I think your 3 options are:
1) get your TM fixed/new TM.
2) a garmin + foot pod http://www.dcrainmaker.com/2011/01/garmin-ant-foot-pods-everything-you.html
3) go outside earlier or later to beat the heat.
Never underestimate the strength of a woman.
Never f@#k with one who runs 26.2 miles for fun.
Agatsu Kettlebell Instructor
Can-Fit-Pro Personal Trainer Specialist
8x marathon finisher/15x half marathon finisher